method

field_name

v7.0.0 - Show latest stable - Class: ActionView::Helpers::FormTagHelper

field_name(object_name, method_name, *method_names, multiple: false, index: nil)

public

Generate an HTML name attribute value for the given name and field combination

Return the value generated by the FormBuilder for the given attribute name.

<%= text_field_tag :post, :title, name: field_name(:post, :title, :subtitle) %>
<%# => <input type="text" name="post[title][subtitle]">

<%= text_field_tag :post, :tag, name: field_name(:post, :tag, multiple: true) %>
<%# => <input type="text" name="post[tag][]">

# File actionview/lib/action_view/helpers/form_tag_helper.rb, line 129
      def field_name(object_name, method_name, *method_names, multiple: false, index: nil)
        names = method_names.map! { |name| "[#{name}]" }.join

        # a little duplication to construct fewer strings
        case
        when object_name.empty?
          "#{method_name}#{names}#{multiple ? "[]" : ""}"
        when index
          "#{object_name}[#{index}][#{method_name}]#{names}#{multiple ? "[]" : ""}"
        else
          "#{object_name}[#{method_name}]#{names}#{multiple ? "[]" : ""}"
        end
      end

field_name

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